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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Retirement Plans [Abstract] |  |
Service period of participants not impacted by pension plan amendment | 15 years |
Age of plan participants not impacted by pension plan amendment | 50 years |
Service period of participants who are age fifty not impacted by pension plan amendment | 10 years |
Decrease in pension plan projected benefit obligation | $ (33,433) |
Pension plan defined benefit plan cost increase limit percentage | 4.00% |
Higman [Member] |  |
Retirement Plans [Abstract] |  |
Decrease in pension plan projected benefit obligation | $ (3,081) |
Pension contributions | 1,615 |
Expected additional contribution | 1,449 |
Pension Plan [Member] |  |
Components of net periodic benefit cost [Abstract] |  |
Service cost | 1,768 | $ 2,227
Interest cost | 4,207 | 3,631
Expected return on plan assets | (5,224) | (5,323)
Amortization of actuarial loss | 678 | 705
Net periodic benefit cost | 1,429 | 1,240
SERP [Member] |  |
Components of net periodic benefit cost [Abstract] |  |
Service cost | 0 | 0
Interest cost | 13 | 12
Expected return on plan assets | 0 | 0
Amortization of actuarial loss | 7 | 6
Net periodic benefit cost | 20 | 18
Other Postretirement Benefits [Member] |  |
Components of net periodic benefit cost [Abstract] |  |
Service cost | 0 | 0
Interest cost | 8 | 6
Amortization of actuarial loss | (135) | (149)
Net periodic benefit cost | $ (127) | $ (143)

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- Definition The service period of eligible participants of the employee pension plan who will be grandfathered and not be impacted by the amendment to the pension plan. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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